JP2001004744A - Lifesaving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lifesaving apparatus which can be applied to all frequency bands as a VHF band, a UHF band, an L band and an X-band and which is small and lightweight by a method wherein the apparatus is constituted of a conical spiral antenna which can deal with all the frequency band and the apparatus is constituted of a component-wave synthesizer which branches a received signal in every frequency band. SOLUTION: In a global marine accident safety system, a VHF-band lifesaving radio apparatus 1, a VHF-band emergency position indicating radio beacon(EPIRB) 2, a UHF-band EPIRB 3, an L-band satellite band EPIRB 4 and an X-band radar transponder (SART) 5 are provided at a ship or a lifeboat. Power supplies are supplied to their transceiving parts from battery parts 12, 22, 32, 42, 52. A conical spiral antenna 7 which is installed in common to their transceiving parts differs from a dipole antenna or a loop antenna, and it has a self-similar structure whose shape is constant irrespective of a frequency. Various characteristics of the antenna such as an input impedance and the like are kept constant irrespective of the frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applicable to a ship or lifeboat at sea,
The present invention relates to a life-saving equipment to be used by floating or to be carried by a climber in the mountains on land and used for rescue activities.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional lifesaving device described in Japanese Patent Application Laid-Open No. 7-270526. In FIG. 3, reference numeral 101 denotes a three-frequency composite antenna, which includes a center loading antenna 101a for transmitting a distress communication wave in the medium and short wave band, and an L for receiving a GPS signal.
It is composed of a band antenna 101b and an X-band slit antenna 101c for radar waves, and these antennas are mounted on a support 102 such as a lifeboat.

[0003] Reference numeral 103 denotes an apparatus main body which accommodates the following apparatuses. A GPS receiver 104 amplifies and processes a GPS signal received by the L-band antenna 101b and outputs positioning data. 105 is a code converter,
The positioning data transmitted from the GPS receiver 104 at a high baud rate is converted into a low baud rate code suitable for narrowband wireless transmission. Reference numeral 106 denotes a transmitter in the medium / short-wave band, which emits a radio wave code-converted at the output of the code converter 105 through the center loading antenna 101a. Reference numeral 107 denotes a radar transponder which, when the slit antenna 101c receives irradiation of a radar radio wave, senses it and emits a response radio wave modulated with a specific code via the slit antenna 101c.

[0004]

A conventional lifesaving device is:
With such a configuration, it is necessary to provide the antenna corresponding to each frequency band, so that the structure becomes complicated and there is a problem that the size and weight cannot be sufficiently reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and the antenna of the lifesaving device is an antenna capable of widening the frequency band.
One antenna is used for all frequency bands of the HF band, the UHF band, the L band, and the X band, and the structure is simplified and the size and weight are reduced.

[0006]

The lifesaving device according to the present invention has a conical spiral wound so as to be able to cope with all frequency bands with a single antenna shared in the VHF band, the UHF band, the L band and the X band. Has an antenna.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Figure 1 shows the GMDS
S (Global Maritime Distress)
FIG. 1 is a diagram showing a configuration of a lifesaving device that is required to be provided on a ship or a lifeboat in a sand safety system (worldwide maritime distress safety system). In FIG. 1, 1 is a VHF band life-saving radio, and 2 is a VHF band EPIRB (Emergency P).
position Indicating Radio
Beacon: Emergency position indicating radio sign), 3 is UHF
Band satellite system EPIRB, 4 is L band satellite system EPIRB,
5 is an X-band radar transponder SART (Sea
rch And Rescue Transponde
r), 6 is a demultiplexer, 7 is a conical spiral antenna, 1
1 is a transmission / reception unit of the VHF band lifesaving radio 1, and 21 is a VHF
Transmitter of band EPIRB2, 31 is UHF band satellite EPI
RB3 transmitting section, 41 is an L-band satellite system EPIRB4 transmitting section, 51 is an X-band radar transponder SAR
The transmission / reception unit of T5, 12, 22, 32, 42, 52
Transmitter / receiver 11 of VHF band lifesaving radio 1, VHF band EP
Transmitter 21 for IRB2, transmitter 31 for UHF band satellite EPIRB3, transmitter 41 for L-band satellite EPIRB4
And a battery unit for supplying power to the transmitting / receiving unit 51 of the X-band radar transponder SART5.

[0008] The VHF band life-saving radio 1 is a "GMDSS
As described on page 145 of "New Maritime Distress Radio Communication System" (published by Seizando Bookstore, 1992), communication between surviving boats, It is a so-called transceiver of a small wireless telephone used for communication between the devices.

The VHF band EPIRB2 is based on “GMDSS-
New Maritime Distress Radio Communication System ”(published by Seizando Bookstore,
As described on page 44 of (1992), this is an emergency position indicating radio sign used in the case of distress in short-distance waters, and transmits a distress signal in the VHF band directly to a coastal radio station. is there.

[0010] The UHF band satellite system EPIRB3 is called "GMD
As described on page 74 of "SS-New Maritime Distress Radio Communication System" (published by Seizando Shoten Co., Ltd., 1992), it is an emergency position indicating radio sign using a Sasat satellite or the like, and is a UHF band distress signal. Is transmitted to the ground station via the Satsat satellite.

[0011] The L-band satellite system EPIRB4 is called "GMD
As described on page 65 of "SS-New Maritime Distress Radio Communication System" (published by Seizando Publishing Co., Ltd., 1992), an emergency location indicating radio sign using an Inmarsat geostationary satellite, and an L-band distress signal Is transmitted to the coastal earth station via Inmarsat satellite.

X-band radar transponder SART
5, in the GMDSS system as described on page 130 of "GMDSS-New Maritime Distress Radio Communication System" (published by Seizando Bookstore, 1992).
It is adopted as the main means of indicating the position of a surviving boat, responding to the radio waves of the X-band search radar mounted on the ship or aircraft, emitting the same X-band radio waves, and The position of the surviving boat is indicated by displaying a signal consisting of 13 points on the radar.

The conical spiral antenna (Co) according to the present invention
As described on page 80 of the “Antenna Engineering Handbook” (edited by the Institute of Electronics, Information and Communication Engineers, published by Ohmsha, 1980), unlike a dipole antenna or a loop antenna,
Since it has a self-similar structure in which the shape is constant regardless of frequency, various characteristics of the antenna including the input impedance are a kind of spiral antenna that is kept constant regardless of frequency. By doing so, the antenna has a feature that the directivity and the gain are constant regardless of the frequency.

Further, the antenna is a helical antenna (He
(License Antenna) has the same effect. Helical antennas are described in the “Antenna Engineering Handbook” (edited by the Institute of Electronics, Information and Communication Engineers, published by Ohmsha,
As described on page 73 of (1980), the antenna has similar broadband characteristics such as antenna directivity and gain due to the structural characteristic of a helical structure.

The splitter / synthesizer 6 synthesizes the transmission signals of the respective frequency bands and radiates them from the conical spiral antenna 7.
This is a microwave circuit for splitting a reception signal in each frequency band from the conical spiral antenna 7 into a reception signal to each component.

Embodiment 2 FIG. 2 shows another embodiment according to the present invention, in which the battery unit included in each component shown in the first embodiment is set as one battery unit 8 and VH
Transmitter / receiver 11 of F-band lifesaving radio 1, VHF band EPIR
The structure is such that power is supplied to the transmitting section 21 of B2, the transmitting section 31 of the UHF band satellite EPIRB3, the transmitting section 41 of the L-band satellite EPIRB4, and the transmitting and receiving section 51 of the X-band radar transponder SART5. It is intended.

In the above embodiment, the VHF band,
Although described based on a lifesaving device using a frequency band such as the UHF band, the L band, and the X band,
The same effect can be obtained in a lifesaving device using a microwave band such as a medium / short wave band or an S band or a C band.

[0018]

According to the lifesaving device of the present invention, by using the antenna capable of widening the frequency band, the antenna can be used for all the frequency bands of the VHF band, the UHF band, the L band, and the X band. , Consisting of one antenna,
Simplified structure and reduced size and weight.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing a first embodiment of a lifesaving device according to the present invention.

FIG. 2 is a configuration block diagram showing a second embodiment of the lifesaving device according to the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional lifesaving device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 VHF band lifesaving radio 2 VHF band EPIRB 3 UHF band satellite system EPIRB 4 L band satellite system EPIRB 5 X band radar transponder SART 6 Demultiplexer 7 Conical spiral wound antenna 8 Transmitter / receiver 11 of VHF band lifesaving radio 1 , VHF band EPIRB2 transmitter 21, UHF band satellite EPIRB
3, a transmission unit 41 of the L-band satellite EPIRB4, and an X-band radar transponder SART5.
Battery section for supplying power to the transmitting / receiving section 51 of the wireless communication apparatus 11 transmitting / receiving section of the VHF band lifesaving radio 1 12 battery section for supplying power to the transmitting / receiving section 11 of the VHF band lifesaving radio 1 transmitting section 22 VHF band EPIRB2 transmitting section 22 VHF Battery unit for supplying power to transmitting unit 21 of band EPIRB2 31 Transmitting unit of UHF band satellite-based EPIRB3 32 Battery unit for supplying power to transmitting unit 31 of UHF band satellite-based EPIRB3 41 Transmitting unit 42 of L-band satellite system EPIRB4 42 L Battery unit for supplying power to transmission unit 41 of band satellite EPIRB4 51 Transmission / reception unit of X-band radar transponder SART5 52 Battery unit for supplying power to transmission / reception unit 51 of X-band radar transponder SART5

Claims (2)

[Claims] 1. A VHF band rescue radio, a VHF band for transmitting a distress report for notifying a self-position, a UHF band
A life-saving device including a radio band indicating emergency position indicating radio band and L-band and an X-band radar transponder for notifying a self-position to a search side in response to an X-band radar signal wave emitted for rescue search is provided. Obi, U
A transmitting and receiving antenna for microwave band such as HF band, L band, X band, etc.
A lifesaving device comprising: conical spiral antennas; and a demultiplexer for synthesizing transmission signals in each frequency band and demultiplexing a reception signal in each frequency band. 2. The lifesaving device according to claim 1, wherein the VHF
A rescue device characterized in that power is supplied from a single battery unit to each of a band rescue radio, a VHF band, a UHF band and an L band emergency position indicating radio sign and an X band radar transponder.